If you left a marker at a hashpoint linking to your expedition page, you can place this template at the top of the page encouraging people to drop a note on the talk page. Also put this same template on the expedition talk page - it automatically detects it's on a talk page and uses slightly different text/instructions.

How to use this template:

{{Advert}}

Template parameters:

image = an image file of a qr code, or the marker itself (without the "Image:" part)